/*
 * Copyright 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.appactions.builtintypes.properties

import androidx.annotation.RestrictTo
import androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP

/**
 * Requires that exactly one of the [variants] is non-null.
 *
 * @throws IllegalArgumentException otherwise
 */
@RestrictTo(LIBRARY_GROUP)
fun requireExactlyOneOf(vararg variants: Any?) {
  val nonNullCount = variants.count { it != null }
  require(nonNullCount == 1) {
    "Exactly one variant must be set but got $nonNullCount non-null values"
  }
}
